linux-kernel - [PATCH v3 2/5] nvmem: core: initialise nvmem->id early Bartosz Golaszewski <bgolaszewski@...libre.com>,Gaosheng Cui <cuigaosheng1@...wei.com>,Greg Kroah-Hartman <gregkh@...uxfoundation.org>,linux-arm-kernel@...ts.infradead.org,linux-kernel@...r.kernel.org,Maxime Ripard <mripard@...nel.org>, Hector Martin <marcan@...can.st>

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Date:   Tue, 03 Jan 2023 16:59:22 +0000
From:   "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Gaosheng Cui <cuigaosheng1@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Maxime Ripard <mripard@...nel.org>,
        Hector Martin <marcan@...can.st>
Subject: [PATCH v3 2/5] nvmem: core: initialise nvmem->id early
    Bartosz Golaszewski <bgolaszewski@...libre.com>,Gaosheng Cui <cuigaosheng1@...wei.com>,Greg Kroah-Hartman <gregkh@...uxfoundation.org>,linux-arm-kernel@...ts.infradead.org,linux-kernel@...r.kernel.org,Maxime Ripard <mripard@...nel.org>, Hector Martin <marcan@...can.st>

The error path for wp_gpio attempts to free the IDA nvmem->id, but
this has yet to be assigned, so will always be zero - leaking the
ID allocated by ida_alloc(). Fix this by moving the initialisation
of nvmem->id earlier.

Fixes: f7d8d7dcd978 ("nvmem: fix memory leak in error path")
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/nvmem/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index bf11e0c36d60..c1a40d9c3825 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -770,6 +770,8 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 		return ERR_PTR(rval);
 	}
 
+	nvmem->id = rval;
+
 	if (config->wp_gpio)
 		nvmem->wp_gpio = config->wp_gpio;
 	else if (!config->ignore_wp)
@@ -785,7 +787,6 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 	kref_init(&nvmem->refcnt);
 	INIT_LIST_HEAD(&nvmem->cells);
 
-	nvmem->id = rval;
 	nvmem->owner = config->owner;
 	if (!nvmem->owner && config->dev->driver)
 		nvmem->owner = config->dev->driver->owner;
-- 
2.30.2